A drawing class was assigned a final project where students had to choose one art medium and one subject. The teacher kept track of the types of projects submitted. The probability that a student used chalk is 0.3, the probability that a student chose to draw a plant is 0.6, and the probability that a student used chalk and chose to draw a plant is 0.2.
What is the probability that a randomly chosen student used chalk or chose to draw a plant?